Recoil inserts are the quick and easy way to repair damaged threads or creating stronger original threads in alloys composite materials in original equipment manufacture. Made from corrosion resistant stainless steel creates stronger threads in most materials simplifies changeover from unified to metric or vice versa. Reduces thread wear is interchangeable with other brands of inserts or tooling. Wide temperature tolerance. Size. Thread Diameter & Pitch. 3/8 unf x 24T.P.I. Length. 1.5 x Diameter.